A violent, savage person can be described as a brute, and so can a wild animal. Someone who's less monstrous but is still unpleasant can also be a brute, and it can be used as an adjective to mean, basically, "brutal."
Definition of brute noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
Characteristic of a brute, especially: a. Entirely physical: brute force. b. Lacking or showing a lack of reason or intelligence: a brute impulse. c. Savage; cruel: brute coercion. d. Unremittingly severe: was driven to steal food through brute necessity. 3. Coarse; brutish.